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J&A Proofs-1J&A Proofs-2J&A Proofs-3J&A Proofs-4J&A Proofs-5J&A Proofs-6J&A Proofs-7J&A Proofs-8J&A Proofs-9J&A Proofs-10J&A Proofs-11J&A Proofs-12J&A Proofs-13J&A Proofs-14J&A Proofs-15J&A Proofs-16J&A Proofs-17J&A Proofs-18J&A Proofs-19J&A Proofs-20